The molecular formula C21H34O2 (molar mass : 318.49 g/mol, exact mass : 318.25588) may refer to:
- Allopregnanolone, a neurosteroid
 - Bilobol, an alkylresorcinol found in Ginkgo biloba fruits
 - BSPP, a drug
 - CP 47,497, an agonist of cannabinoid receptor
 - Epipregnanolone
 - Isopregnanolone
 - Methasterone, an anabolic steroid
 - Pregnanolone, a neurosteroid
 
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